Cooling
Posted: Fri Feb 17, 2012 10:17 pm
There has been much discussion in the past on this list about 0320 cooling
with the slower amphibs and the fibreglass speed cowl on the Rebel. I did
some work on my exit as per recommendations from this group last Fall, and
thought I had the problem licked. However, now with the hot summer days
(over 30 C a week ago here on the wet coast), I am still not satisfied. I
can't climb at full throttle for more than about 3 minutes before #3 CHT
gets up to 450 and I have to back off and level out for awhile before
resuming climb. Cruise is about 425 on a hot day, and down to about 380 when
it is cool, like a few months ago.
Wayne, I saw on your website a picture of GCYP (Howard's I believe), and it
looked like it had a big shrouded exit on the bottom of the cowl. Do you
have any close-up pictures of that? While I have a big hole and deflector
there for mine, I don't have it extended to the back of the firewall and
don't have lips on it right now either.
Also, I remember you saying that Howard was using a finer pitch Sensenich 2
blader which might have some effect too. I am still running the 3 blade Warp
with the UHS fibreglass spinner. The spinner is slightly smaller than the
cowl, and perhaps this is causing some turbulence at the inlets.
Anyway, I am determined to get this problem licked once and for all now that
summer is here. Any help and ideas from anyone on this would be greatly
appreciated. Thanks.
Walter
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
with the slower amphibs and the fibreglass speed cowl on the Rebel. I did
some work on my exit as per recommendations from this group last Fall, and
thought I had the problem licked. However, now with the hot summer days
(over 30 C a week ago here on the wet coast), I am still not satisfied. I
can't climb at full throttle for more than about 3 minutes before #3 CHT
gets up to 450 and I have to back off and level out for awhile before
resuming climb. Cruise is about 425 on a hot day, and down to about 380 when
it is cool, like a few months ago.
Wayne, I saw on your website a picture of GCYP (Howard's I believe), and it
looked like it had a big shrouded exit on the bottom of the cowl. Do you
have any close-up pictures of that? While I have a big hole and deflector
there for mine, I don't have it extended to the back of the firewall and
don't have lips on it right now either.
Also, I remember you saying that Howard was using a finer pitch Sensenich 2
blader which might have some effect too. I am still running the 3 blade Warp
with the UHS fibreglass spinner. The spinner is slightly smaller than the
cowl, and perhaps this is causing some turbulence at the inlets.
Anyway, I am determined to get this problem licked once and for all now that
summer is here. Any help and ideas from anyone on this would be greatly
appreciated. Thanks.
Walter
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------